Portable press



. 193.5- J. H, ABRAMSON ET AL 1,986;493

PORTABLE iRESS Filed May 9, 1932 5 Sheets-Sheet l Jan. 1, 1935. J. H.ABRAMSON r AL PORTABLE PRES S Filed May 9 1932 3 Sheets-Sheet 5 8 0 3 Hu M z 7 m 3 9 n 9 u 1 i n u a W 1 w M%\ 1 5 1 W m f J wv( Z]; gg v k 25through th operatiombecomms badly Fig. 4 iso fragmentary view showingthe man- PatentedJan. 1,193s I 1,986,493

umreo STATES; PATENT OFFICE l mom a i a,JohnQHei-b'ertAbrammn'ind'EdwinC. Swanson, H Rock1f0rd,,m',,,assignorgtoGrcenlec, Bros. &

G0,; Roekijord, 111., a. corporation.- Illinois 1 appuosuon- May '9,1932', serial No. 610,296

comma. (ciao-as) This invention relates to mechanism especially IAnother object of the invention is the proviadapted for use in removingand inserting the sionof hydraulically operated means for pushing pinsand bushings of tracks, such as used in the pins and bushings of atractor. crawler type tractors. a We have also aimed to provide improvedThe individual shoes-oi the tracks'ior crawler means for holding thetrack whilethe pins and type tractors are held together bymeans ofbushings are being pushed and for guiding the and bushings, whichare'irictionally held in same during the pushing operations. pl y are sm led, whenmanuiaetui'ed. A further object of the invention is theproviby forcing the pins and bushings into position. sion of portablemechanism which may be supunder extreme pressure, in the region of fiftyported upon'the track for the removal of the tons. When these tractorsgo'out into use it is same {mm the tractor. q n y necessary to r pel thetr in th We have also aimed to provide improved means field andconsiderable .dely e pen are 'ior positioning the mechanism with respectto occasioned if it is necessary to return the tractor th track for thepushing operation. a

t0 e manufacturer f r r p In the P i Otherv objects and attendantadvantages will 15 repair o the e n fi d, has e e become apparent tothose skilled in theart as n wi h h re te t dim ultyjdile th thefollowing description proceeds and from the treme pressure under whichthe pins and the ac om anying drawings, in whichbushings are inserted.The only tools available Figure 1 1 a, top view of the machine sein h-fi f r th r ve-In these p r h cured to a track in a position to removea pin been a punch and a; sledge. The operationhas therefrom; r quiredtwo men, on o h th P and Fig. 2 is a verticalsection on the line 2-2 ofone to swing the sledge; Frequently, the chains, Figure 1 bushings, andtrack shoes are badly damaged .Fig. 3 is ,asection" on the line 3-3 ofFig. '2;

tered from the driving asto render themworthm whi h 5, pi is inserted; Vless. Often a shoe is so badly battered in r Fig. 5 is a fragmentaryelevation of a modified moving the pins andsbushingsthat it becomes fonnof n y, impossible to'reinsertthese'parts afterthe repair n; 6 topviewof form shown in has been made. Furthermore, it is common f or p1 5;f v

workman 5 t during 3 Fig. 7 is a fragmentary top view of a modifiedbecause one the m u eho en ch form of vmachine adapted forpushing'bushings; while the other Strikes Y is lto Fig. 8 is anelevation of the mechanism shown hold the shoes securely in aconvenientposition in Fig the bolster member being in section,

3;, for driving. In iaddition to these. objections, and Y considerabletime is required- O the average a Fig; 9 is a topview ot a second typeof bolster it takes two men in the neighborhood of eight for s withbushings. v J hours to repair cemplete track by t met The, form. or theinvention illustratedin the heretofore m Pi our 's wh drawingscontemplates a fluid driving unit and'a Plates devicewith i the "P imay. bolster supported upon the driving unit but m s 1 two hours or 1955without spaced to serve as" anabutment for preventin danger oflmurytothe workmgfn damage to movement of the work piece when force isaph g gn f g zgg plied thereto; While the device is suitable in remove am canbemdledsmyiwwmi535it?tfiififiifiii itiiiii t itiat in culty thattheycanmt anon-many to which they 'haveia Dress fit, it is particularlymachme the t, mi fi fi adapted for use in assembling and disassemblin ASresult 0 ese ac f the tracks of so-called crawler typ tractors. adifilcult problem to develop sufilciently simple v b p 1 ted t devicecapable of developing the desired [pow r z gz t e gegr ig iz go 30113221: as g 50 125.? ti c k. equlre vexcesive" f 91 that the floor maynormally serveto support the A major object of our invention is theprovi work piece but being formedto be capable of sion of improvedmechanism for, removing and support directly upon the tractor forremoval inserting the pins and bushings iromal track. of the first pin,it being necessary to remove this 5 pin before the track may be removedfrom the tractor.

Referring first to Figs. 1 to 4, inclusive, a body 11 is provided withsockets 12 and 13 for the reception of one end of side rods 14 and 15.The threaded pins 10 on opposite sides of the body 11 serve to securethe rods 14 and 15 within the sockets and permit their rapidconvenientremoval, a bolster, designatedgenerally by' 16, being supported upon theopposite ends of the rods. The body 11, shown in section in Fig. 2, isprovided with a cylinder 17 between the sock ets 12 and 13, a piston 18being positioned therein for projection outward between the rods 14 and15 and in a direction parallel therewith;

A packing leather 19 is secured to'the inner end" of the piston 18 and apacking 21 on the inner side of the cylindersurr'ounds the piston and isheld in position by a retaining ring 22. The body is also provided witha well 23 in which is 'posi tioned injectors 24 and 25, which passthrough the walls of the body and project from the upper side thereof.The injectors are arranged, through deferences in stroke and bore, toinject difierent amounts of liquid from the reservoir into the cylinder17 upon reciprocation of the plungers 26. and 27. Reciprocation of theplungers 26 and 27 is brought about through forked levers 28 and 29which are pivotally connected at one end to the body through links 31and 32 and at an intermediate point to the plungers. Handles 33 and 34receivethe oppositeends of the levers for manual rotation thereof tocause reciprocation of 'the plungers. The injectors 24 and 25 areso'constructed that the fluid in the cylinder 17 may be released forreturn .to the well 23 by abnormal depression of the plungers.'

Handles 35 pivotally supported on the body serve to facilitate themovement of the device.

. The bolster 16 consists of a cross-arm 36 having sockets 37 and 38 forthe reception of the ends of the rods 14 and 15, the rodsbeingreleasably held therein by means of threadedpins 39, thepins havingwings 41 to facilitate the rotation .of the pins. Intermediatethe'so'ckets 37 and 38 is an opening 42 which serves to receivev andguide a plunger rod 43 presently to be more fully described. The opening42 joins a ,slot 44 which is provided on its forward end with a marginalslot 45. The slot 45 serves as an abutment against which is received aboss 46 surroundingan opening 47 of a track, designated generally by thenumeral 48, the opening 47 serving to receive a track pin-49 with apress fit. The bolster is also provided with an abutment 51 adapted torest upon the opposite side of the track 48 and connected to thecross-arm 36 by means of a yoke 52 which may advantageously be integralwith the cross arm and the abutment. The abutment is provided with atapering bore 53 and a 'counterbore 54, the two bores providing anopening through which the pin 49 may pass as'it is expressed from theopening 47 of the track. The inner faceof the abutment is provided witha U-shaped slot 55 similar to the slot 45 and best shown-in Fig. 3. Theopen end of theslot is at the lower side of the bolster, the slots 45vand 55 permitting thebolster to he slipped down over the track, the boss46 moving into-the slot 45, and the boss 56 on the opposite side of thetrack moving into the slot 55. These-slots serve to position theopenings 54 and 42 with respectto the track, centering the pin 49 sothat it will coincide with these openings. wwings 57 and 58 .holes 63are openings through which the cleats of the track are normally securedthereto so that-in securing the bolster to the track, it is necessary toremove two adjacent cleats.

'Screws 64 are threaded into the lower side of the wings 57 and 58 andbear against the upper side of the track, thereby cooperating with theslots 45 and '55 in centering the pin 49 and the openings in thebolster. The screws 64 will be screwed into the wings more or lessdepending upon the size of the particular track being operated upon.

In order to transmit the movement of the piston 18 to the end of the pin49, a cross-bar 65 having openings 66 and 67 near opposite ends thereofis positioned upon the rods 14 and 15, the rods passing through theopenings 66 and 67, respectively. The openings are suificiently large.-to permit the bar to move longitudinally along the rods. The bar 65thus presses against the end of the piston 18, as shown in Fig. 2. Thebar is provided with an opening 68 substantially on the center line ofthe piston for the reception of the reduced end 69 of the plunger rod43, the peripheral shoulder 71 bearing against the face of thecross-bar. The opposite end of the plunger rod 43 is reduced indiameter, as shownat 72, so as to be capable of entering the opening 47in the track and isarranged to bear against the end of the pin 49. Thus,upon projection of the piston 18, the plunger rod 43 is urged againstthe end of the pin 49 causing it to be expressed from the opening 47into the opening in the abutment 51. .During this operation, theabutment prevents movement of the track 48 by contact of the boss 56with the abutment in the slot 55. The portion 72 of the plunger rod neednot extend the full length of the plunger since it is only necessary tomove-the pin 49 a short distance to ,release it from the track. Thus,the press fit between the pin and the track occurs only in the area 73in which the pin is of greater diameter than throughout the remainder ofits length, the portion 73 of the pin having a press fit in the outerear 74 of one of the track shoes. Coiled springs 75 and 76 surround therods 14 and 15 andbear at one end against pins 77 and 78 in therods. Theopposite ends of the springs bear against the cross-bar 65, the springscausing the piston 18 to be moved back into the cylinder 17 when fluidpressure is removed by operation of the injectors" r In Figs. 1; and 2,we haye shown the device as used for the purpose of removing the firstpin from the track when the track is in position uponthe tractor. Inaccomplishing thisoperation, the device is clasped by the handle 35 andby a handle 79 on'the yoke 52, and the bolster is lowered over the trackfrom which two adjacent cleats. have been removed. tflhe bolts 62 arethen inserted thus securing the bolster-firmly to the track. The screws64 will, ,o f; course, have been set .toaccommodate the particular sizeof track. The plunger rod 43 is then inserted in ,the opening 42 and theend 69 thereof is inserted in theopening 68 of the cross-bar 65., Atthis .the piston 18 will beirapidly projected until the forward endofthe plunger rod 43 comes incontact with the end of the pin 49. It thepin is not held too firmly, continued reciprocation of the.

plunger 27 will cause the same to be expressed from the opening 47.However, if greater power is required to loosen the pin, the plunger 26may be reciprocated, whereupon the piston 18 will be projected with lessspeed but with greater power thereby providingthe extra power necessaryfor loosening the pin. When the pin 49 has been removed sufficiently toremove the portion 73 thereof from the boss 56, operation of theinjectors is'no longernecessary since the remainder of the pin: jay bewithdrawn with the fingers. At this point, the fiuid is-released fromthe cylinder 1'? and thepiston 18 is retracted by operation of thesprings '75 and76. The expressing operation is then complete and thebolster may be removed from the track. Forthe removal of the remainderof the pins, the track-is removed from the tractor and spread out uponthe floor with the cleats downward, as shown in Fig. 8. In thisposition, the press may be laid fiat upon the floor with the bolsterresting over the track; the cleats supporting the remainder. of thetrack .at such elevation that the press operate horizontally. Thisposition of the track is shown in Fig. 8, The press.

may then be rapidly moved from pin to pin without in any way moving thetrack during the expressing operations. 3 Since the removal of the,

pins separates the trackinto a plurality of relatively small shoes, itwill be seen that the use of the mechanism describedsubstantiallyeliminates the necessity for handling a heavy track while it is beingdisassembled.

As previously stated, the press may be used with equal facility for thepurpose of inserting the pins 49 and reassembling the track. Such.operation of the device is shown in Fig. 4. I In this case the pressislowered over the track with.

the plunger rod 43 in a position to bear against the portion '73 of thepin to cause the pin to be moved into the opening 47, the bolts -62being then inserted in theopenings 63 on the opposite side of the track.

, When very wide tracks are to be operated upon, we have found itconvenient to employ the modifications shown in Figs. 5 and 6. In thisinstance, the rods 14 and 15 are replaced by similar rods 81 and 82 ,ofsuflicient length to extend to the side of the track opposite thepushing unit. A bolster having-a cross-arm83 is positioned atthe end ofthe rods which are received in sockets 84 and85 thereof Midway betweenthe sockets 84 and 85 is an abutment 86 in the form of a boss projectingtoward the track. An opening 87 extends through the cross-arm 83 and theabutment 86 to permit the pin to pass outwardwhen expressed. Theabutment 86 is provided with a, U-shaped slot 88 similar to the slots 45and 55, the open end of the slot, however, being at the upper side ofthe abutment so that the track may be inserted from the top. A plungerrod 89 is employed substantially similar to the plunger rod 43 exceptthat it is of sufficiently shorter length to accommodate the track ofgreater width. The operation of this modification is substantiallythesame as that already described.

In Figs. 7 and 8 we have shown a device similar in its generalprinciples of operation to that shown in Figs. 1 to 4, inclusive, butadapted for the purpose ofremoving the bushings from the track insteadof the pins. In this device, the work piece consists only of independentshoes of the track rather than the track as a whole,,and, consequently,the wings 5'7 and 58 of the bolster are unnecessary. The bolster,therefore, consists of a cross-arm 91 and an abutment 92 connected bymeans of. a yoke 93 having a handle 94 thereon." The cross-arm 91 isprovided with sockets 95 for thereception of the rods 14 and 15 and withan opening 96 between the sockets 95,the openingimmerging on the plaininner face of the arm.' The lower surface of, the cross-arm is providedwith a plurality of serrations or grooves 97 intowhich the upper edge ofthe cleat 98 of the shoe 99 fits, these grooves permitting the workpiece to move up sufiiciently far into the bolster for setting. Theabutment 92 is provided with an opening 101 coaxial with the opening 96of the cross-arm, this openirTg permitting the bushing 102 of the shoeto pass through the abutment. The lower side of the abutment is tapered,as shown at 103, to permit the abutment to come in contact with the sidewall, of the shoe between the top plate 104 thereof and the bushing. Aplunger rod 105, similar to the plunger rod 43 except for the outer endthereof, is positioned with its inner end in the opening 68 of the bar65, as previously described. The

free end of the plunger rod 105- isprovided with a portion 106 ofsmaller diameter than the reoperation, the portion 106 of the plungerrod moves into the center opening 47 of the bushing and the shoulder 107comes into cont act with the end of the bushing so that when the piston18 is projected outward, the plunger rod will force the bushing out ofthe shoe by contact of theshoulder 107 against the end of the bushing. Apilot pin 108is adapted to be positioned in the opening 101 of theabutment and is provided with an end portion 109of a diameter to bereceivable within the bushing, the pin being-relieved at 110 for freedomof movement. The pilot pin serves to guide the bushing from the shoeinto the abutment opening 101 to 19136 vent damage to the bushing inremoving or iriserting the same. The relief portion 110 is of such adiameter as to be receivable in the bushing opening 111 so as to guidethe end of the bushing past the intersection of metal in the shoewhenthe bushing is being inserted. Thus, the deyice shown in Figs. '7 and 8is essentially the same as that shown in Figs. 1 to 4, inclusive, withthe exception that the parts are so shaped as to accomplish the removaland insertion of the bushing rather than the pin.

In Fig. 9, we have shown a modified form of the bushing expressingmechanism. In this form, a cross-arm 112 is positioned on the ends ofside rods 81 and 82 and is provided with sockets 113 for the receptionof these rods, the rods being secured by means of threaded pins 114, aspreviously described. An abutment 115 having an opening 116, similar tothe opening 101' of Fig. 8, is formed on the cross-arm 112, the abutmentbeing adapted to bear against the side of the shoe in the same manner asshown in Fig. 8. This modification is adapted to function in the samemanner as the device in the above-mentioned figure but is designed foruse in expressing the bushings from the shoes of wider tracks, the onlyfunctional difference being that the rods 81 and 82 are longer toaccommodate the wider shoes and a plunger rod 117 identical in shapewith the plunger rod 105 is provided, the plunger rod 117 being ofshorter length.

It will be seen thatwe have provided portable mechanism for expressingthe pins and bushingsfrom the tracks of crawler type tractors which maybe readily moved about from place to place. The press is constructed foruse ina'horizontal position so arranged that the floor serves as thesupporting means for the track. As a result of this construction, it isunnecessary to move thgl trapk to accomplish the removal of thevariouspinsfthe device being susceptible oi movement along; the trackto'the position of the pins. The press resting upon the floor, permitsthe operator to stand directly over the mechanism for theconvenientoperation of the injector handles so that it. is operated witha maximum of convenience.- The device is capable'of use not only forassembling and disassembling the track after it is removed'from thetractor but is capable of use directly upon the tractor for the purposeof moving'the first pin and accomplishing the removal of the track from-;3the tractor. The press is so arranged that'interchangeable bolstersand plunger rods may be employed to accommodate the. device for use.upon a wide variety of work. pieces, in this instance accomplishing theremoval of not only the pins but" of the bushings from tracks of anywidths. The further feature of the device is that the piston and plungerrod are automatically returned to their retracted position by therelease of the pressure in the cylinder, thereby increasing the speed ofoperation of the device? The press may be used with equal facility-{forboth assembling and disassembling the track. As

a result of the operation of the device, the pins, bushings and. shoesoi the track =are notxin any way damaged, being smoothlyexpressed andimpressed without being in any way battered or depreciated through theoperation; Furthermore, the device permits the accomplishment of [thiswithout any danger of injury to the operator andiat a much greatenrateofispeed than has heretofore been possible. It permits the workto .beaccomplished by a single workman in substantially one-fourth of the timepreviously required for two men, thereby substantially reducing the costof repair operationseon this type of machinery.

While we have thus described and illustrated a specific embodiment ofour invention we are aware that numerous alterations and changes may bemade without materially departing from the spirit of the invention'o'rthe scope of the appended claims, in which we claim:

1. A press of they character described comprising a body provided with ahydraulic piston adapted to be projected in a pressing stroke, a plungershaped to be positioned wan an end against a frictionally held.elementof a work piece and positioned to be moved by said piston to move saidelement, and a bolster supported on and spaced from said body to preventmove-. ment of.the work piece when force is applied to said frictionallyheld element said bolster comprising a cross-arm spaced horns andsupported at spaced points on theboiiy anopening intermediate saidspaced points to guide :the plunger, an abutment spaced from thecross-arm for the reception of the work-piece therebetween, and meansfixedly connecting the cross-arm and the abutment.

2. A press of the character described, comprising a pressing unit, aplunger, means on said pressing unit for moving the plunger in apressing stroke against the end of a frictionally held a track havingfrictionally held elements and 20 bosses surrounding the same, saidbolster being arranged to provide abutments at opposite sides thereof,said abutments "having sockets for the reception of said bosses andopenings for the passage of said pushing member and said frictionallyheld elements, and meansv for moving said plunger in a pressing stroketo insert or remove said irictionally held elements.

4. A press 0! the character described comprising a pressing unit havinga cylinder, a piston, means for injecting fluid to said cylinder to movesaid piston in a pressing stroke, spaced side arms on said unit, abolster supported upon said side arms to act as an abutment for awork-piece, a cross-bar slidably supported on said side arms in aposition to be moved by said piston during the pressing stroke, and aplunger .s lnported on said cross-bar in a position to engage africtionally held element of said workpiece, said plunger being movablewith said cross-bar to move the frictionally'held element in anoperative position on the floor and having a movable piston, a handlearranged to project said piston upon reciprocation and shaped to bereciprocated by an operator standing over the unit, a pair of armsshaped to interchangeably support .any of a plurality of bolsters inspaced relation to said piston, a bolster for holding a work-piece, aplungeracting between thepiston and the work-piece for transmittinga'pressing pressure to the latter, means carried by said arms forsupporting any of a plurality of plungers of diil'erent shapecharacteristics in operative relationship with said piston andaccomplishing different pressing operations, and means carried by saidarms for returning the piston. from its projected position.

'6. In a portable press of the character described, bu'shingpressingmechanism comprising'an abutment adapted to abut against awork-e piece having a bushing opening, said abutment having an openinglarger than said bushing opening, pilot means shaped to be passedthrough the opening in the abutment and into the opening of thework-piece; and bushing to pilot the bushing during the movementthereof,.

work-piece, and an opening for the passage of a member expressed fromthe work-piece; and said cross-arm having an opening for the reoeptionof an expressing plunger, and means for supporting the bolster.

8. A portable press shaped to rest upon the floor for removing pins andbushings from tractor tracks when resting on the floor tree of thetractor comprising a hydraulic pressing unit having a movable piston, ahandle on the top of said unit arranged to project said piston uponreciprocation and shaped to be reciprocated by an operator standing overthe unit, a bolster for holding the track in a desired position, meansfor connecting the bolster to the unit, means acting between the pistonand the workpiece for transmitting a pressing force from the former tothe latter, and means on the press for supporting the same on the trackwhile the latter is positioned on a tractor for removing a pin from thetrack, to remove the track from the tractor.

JOHN HERBERT ABRAMSON. EDWIN C. SWANSON.

